The value of 'x' for which the angle bet...

The value of 'x' for which the angle between `bara=2x^(2)bari+4barxj+bark and barb=7bari -2barj+xbark` is obtuse and the angle between `barb` and Z-axis is acute and less then `pi//6`, are

A

`0ltxlt1/2`

B

`1/2ltxlt15`

C

`xgt1/2 or xlt0`

D

No value of x

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The correct Answer is:

D

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